Micrometer-calipers.



PATENTED JAN. 29, 1907.

I. SPALDING. MIGROMBTER GALIPERS.

APPLIUATION FILED JUNE 29.1906.

IN YENZ'UH R%DFNZ w w W UNITED STATES PATENT OFFICE.

FRANK SPALDING, OF PROVIDENCE, RHODE ISLAND, ASSIGNOIt TO BROWN & SIIARPE MANUFACTURING COMPANY,- Ol PROVIDENCE,

RI [ODE ISLAND.

M IC ROM ETEFl-CALIPE RS- Specification of Letters Patent.

Patented an. 29, 1907.

Application lllod June 23,1805, Serial No. 266,562-

To all whom it my concern.-

Be it known that 1, Fauna SPALDING, a citizen of the United States, residing at Providence, in the county of Providence and State ol lthodc island, have invented a new and useful Improvement in Micrometer- Calipers, of which the following is a spec-iiication.

This invention has reference to an improvement in micrometer calipers, and more particularly to an improvement in inside mierormtor-calipers.

The object of my invention is to improve the construction of inside micrometer-calipers, whereby the measurement of inside diameters is facilitated.

My invention consists in the peculiar and novel construction of an inside micrometercaliper comprising a spindle, a fixed jaw having means for adjustment on the spindle, a sliding jaw on the spindle, means for preventing rotation of the sliding jaw on the spindle, an. interna]lpserew-threaded sleeve on the sliding jaw, a JllII'Cl rotatably secured to the spindle, an externall -scrcw-threadcd inner tube in the barrel an a ted to engage with the inlernally-screw-t ircaded sleeve on the sliding jaw, means for taking up wear between the s eeve and the tube, means for locking the sliding jaw in its ad usted position, and other details of construction, as will be more fully set forth hereinafter.

Figure 1 is a face view of my improved inside 1nierometer-caliper, showing the same constructed to measure inside diameters from one to two inches by one-thousandths of an inch. Fig. 2 is an enlarged sectional view taken lengthwise throu h the caliper, showing the constmction of the caliper; and Fig. 3 is an enlarged transverse sectional view through the sliding jaw and spindle of the calipcr,taken on line 3 3 of Fig. 1.

In the drawings, a indicates the spindle, b the lixed jaw, c the sliding jaw, d the internally-screw-threaded sleeve on the sliding jaw, e the barrel, f the externally-screwthreaded tube in the barrel, and g the locking screw, of my improved inside micrometer-' cali er.

The spindle a has a reduced portion a, forming the annular shoulder a for the inner end of the tube f, a'serew-threaded end a for the collar a, and the lock-nut a, the two oppositely-disposed longitudinal grooves a a", and the screw-threaded hole a in the opposite end oi the spindle for the adjustingscrew a", as shown in Fig. 2.

The fixed jaw b has a hole I) for the spindle a, with the countersunk portion I) for the head of the adjusting-screw a", a set-screw b adapted to engage with the spindle a, and the shouldered end b. The jaw]; is adjusted lengthwise on the s indie a by the screw a and firmly secure in its adjusted position by the set-screw l), as shown in Fig. 2.

The sliding jaw c has a hole 0' for the spindle a, the two oppositely-disposed lon itudinal ribs 0 c on the interior wall of t e hole c for the grooves a" a in the spindle a, a screw-threaded hole 0" for the lockingsc-rew g, and a shouldered end c. The shouldered ends (1 and c on the jaws are shaped to enter the article to be cali cred, the shoulders on the jaws limiting tie inward movement of the jaws.

The internally-screw-threaded sleeve (1,

through which the spindle a extends, is formed integral with the sliding jaw c and has a split and tapered screw-threaded end d, on which is a nut d, as shown in Fig. 2, and the usual scale of one inch divided into il'prty equal parts on its exterior, as shown in The barrel e has a knurled portion a, a taered end e", on which are graduations indicatmg one-fortieth of an inch divided into twenty-five equal arts, and the externallyscrew-threaded to e f, formed integral with the barrel and havin Y a central borej" for the reduced portion a 0 the spindle a, as shown in Fig. 2. The barrel e is rotatably secured to the reduced portion a, of the spindle a, between the shoulder a and thecollar a, by the lock-nut a, with the tube f in screwthread enga ement with the sleeve (1. By turning the liarrel e the sliding aw c is reciprocate lengthwise on the spindle a and prevented from rotating on the spindle by the ribs 0 c on the jaw engaging with the grooves a a in the spindle.

When an accurate measurement is taken for future reference, the sliding jaw c is locked to the spindle a by the locking-screw g. ear is compensated for between the sleeve (1 and the tube f by tightening the nut d on the split end d of the sleeve, and wear on the jewel) and c is compensated for by adjusting the jaw b on the spindle e by the adusting-serow a, as shown in Fig. 2.

It is evident that the jaw I; could have ribs in the hole 11', adapted to engage with the grooves e" a in the spindle, and that the jaw I) could have a longitudinal movement toward the jaw c and then seeured by the setserew b for measuring the inside diameters of less than one ineh. without materially affecting the spirit of my invention.

Having thus deseribed my invention, l claim as new and desire to secure by letters Patentl. An inside mierometer-ealiper eomprising a spindle, a fixed jaw on the spindle, a sliding jaw on the spindle, an internallyscrew-threaded sleeve on the sliding 'aw, a barrel rotatably secured to the spim le, an externally-serew-threaded tube in the barrel adapted to engage with the internally-screwthreaded sleeve on the sliding jaw, means for adjusting the fixed jaw on the spindle, and means for locking the sliding jaw to the spindle, as deseribed.

.2. In an inside micrometer-caliper, the eombination of a spindle a having the reduced portion a, forming the shoulder a, the serew-threiuled end a, the collar and the leek-nut e on the end e, the longitudinal grooves a a", the serew-thremled hole a, the adjusting-screw e in the hole e, a fixed jaw is a a v: as

I) having the hole I) with the countersunk portion (1", the setserew If and the shouldered end I), a sliding jaw c having, the hole 1:, the ribs 0'' t in the hole (1' adapted to engage with the grooves e a in the spindle, the serew-tbreadml hole 4: and the shouldered end 1:, an internally-serew-threzuled sleeve (1 formed integral with the sliding jaw e and having the split and tapered screw-threaded end (1'', a nut d on the end d, and the usual seale on the exterior oi" the sleeve, a barrel 1' having the knurled portion a, the tapered end 4: on which are grauluations, an externally-serew-threaded tube f l'ormed integral with the barrel :1 and having the central bore f [or the redueed portion a ol the spindle (1 and a lo -.king-serew g in the serew-threaded hole in the sliding jaw 0, whereby the jaw I) is mljustable on the spindle e, the jaw c is reeiproeaterl on the spindle e and locked to the spindle by the loeking-svrew g and wear is eompensated for between the sleeve d and the tubefand between the barrel e, the shoulder a on the spindle and the eollar a, as described.

in testimony whereof l have signed my name to this spmzilieation in the presenee oi two subscribing witnesses.

FRANK SIAIJDINU. Witnesses:

Aim 1*). llAGER'rv, J. A. MILLER, Jr. 

